Get Tapajara, dump all upgrades into stamina, go to the red obelisk, fly around Obelisk until 1 spawns, land get in front seat, use whistle Commands to control Tapajara, whistle attack and use tranq darts while following quetzel, don't allow Tapajara to make contact, Do not drop quetzel over water
The fun way is to jump off and grapple to your argie and whistle it to attack and since argies are slow it won’t catch up in time so tranq till it goes out also bring parachutes and consider liking so more people will know
If you drop a quetzal due to knockout, and it lands next to a giga...just know, the quetzal belong to the giga. Now you get to watch your would be quetzal get eaten by a giga. Now you can go home and cry.
I know this is pretty common knowledge, but for the guys who always find the quetzal they're trying to tame in an area loaded with sabertooths, carnos, and rexes, all quetzals that are frightened will fly towards the coordinates 50, 50, every single time.